If the plug for the shelving unit is wrapped up in the back of the chamber, it can indeed push the shelving unit forward against the gasket, causing a poor seal and resulting in higher vacuum pressures.

Here's the procedure to ensure this doesn't happen:

1. Before inserting the shelving unit into the chamber, make sure the plug is positioned to the side of the shelving unit, not directly behind it.

2. Carefully slide the shelving unit into the chamber, ensuring the plug doesn't get caught or wrapped up in the back.

3. Once the shelving unit is in place, replace your door gasket and shut the door.

By following these steps, you should be able to prevent the plug from interfering with the shelving unit's position and ensure a proper seal for optimal vacuum pressure.

Alternatively, this may indicate that your shelving unit is dirty or wet and will require proper cleaning and drying. Please refer to your owner’s manual for these instructions

If the issue persists after completing these steps then please reach out to our customer support team for further assistance.